Properties
6+0=
0+6=
6
Commutative Property
The numbers you add are called __________.
Addends
2+ ( 5 + 13 ) = 13 + ( 2 +___ )
5
Estimate by rounding to the nearest ten.
67+31=
70+30=100
238
240
Estimate the difference of 176 and 143 by rounding to the nearest ten and then subtracting.
176-143 =
180 - 140 = 40
Find the solution and name the property shown.
4+7=
7+4=
11
Commutative Property
The ____ is what we call the answer to an addition problem.
Sum
10 + 4 = __ + 10
4
465+73=
470+70=540
Round to the nearest hundred.
68
100
Estimate the sum of 290 and 322 by rounding to the nearest hundred and then adding.
290 + 322 =
300 + 300 = 600
_______ + 0 = 19
19
Zero (Identity) Property
This property states that adding zero to any number, the sum is that number.
The Zero (Identity) Property
345 + 234 = ____ + 345
234
Estimate by rounding to the nearest hundred.
324+84=
300+100=400
Round to the nearest ten
7
10
55 + 34 + 112 =
60 + 30 + 110 = 200
Find the solution then name the property shown.
5+(6+4)=
(5+6)+4=
15
Associative Property
Commutative Property
195 + ___ = 195
0
Estimate by rounding to the nearest hundred.
898+746=
900+700=1,600
Round to the nearest hundred
3,432
3, 400
Which ten is closest to 743?
740 is the closest ten to 743.
6+(4+2) =
6+(2+4)=
12
Commutative Property
This property states that you can group addends in different ways and still get the same sum.
Associative Property
358 + ( 999 + ___ ) = 999 + ( 358 + 420 )
420
Estimate by rounding to the nearest ten.
784+246=
780+250=1,030
Round to the nearest ten
1,672
1,670
a. 106 + 168 = 274 b. 110 + 170 = 280
c. 100 + 200 = 300 d. 105 +165 = 270
e. 100 - 170 = 70
106 + 168 =
b. 110 + 170 = 280 and
c. 100 + 200 = 300